Question

What is the area of this triangle 9cm , 12cm , 15cm

Answer 1

Given sides of the triangle

• a=9cm
• b=12cm
• c=15cm

The given triangle is a right angle triangle

because 92+122=152

Area of traingle= $\bf\frac{1}{2}&timesbase×height$

∴Area =$\bf\frac{1}{2}×9×12=54 sq cm$

Area =54 sq cm.

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Answer 2

Answer:

54 cm²

Step-by-step explanation:

Area of triangle √s (s-a) (s-b) (s-c)

a = 9 cm , b= 12 cm , c= 15 cm    

s= a+b+c/2      

=  9+12+15/2

= 36/2      

= 18 cm

Area = √18 (18-9) (18-12) (18-15)

 =√18 x 9 x 6 x 3

 = √9 x 2 x 9 x 3 x 2 x 3

 = 3 x 2 x 9

Area = 54 cm²

hope it helped you

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